[ObjC ARC] Converts ios/chrome/browser/ui/ntp:ntp_internal to ARC.

ios/chrome/browser/ui/ntp/new_tab_page_bar.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_CHROME_BROWSER_UI_NTP_NEW_TAB_PAGE_BAR_H_
 #define IOS_CHROME_BROWSER_UI_NTP_NEW_TAB_PAGE_BAR_H_
 
 #import <UIKit/UIKit.h>
 
 #import "ios/chrome/browser/ui/ntp/google_landing_view_controller.h"
 
 @class NewTabPageBarItem;
 
 @protocol NewTabPageBarDelegate
 // Called when new tab page bar item is selected and the selection is changed.
 // If |changePanel| is true, bring the panel into view in the scroll view.
 - (void)newTabBarItemDidChange:(NewTabPageBarItem*)selectedItem
                    changePanel:(BOOL)changePanel;
 @end
 
 // The bar in the new tab page that switches between the provided choices.
 // It also draws a notch pointing to the center of the selected choice to
 // create a "speech bubble" effect.
 @interface NewTabPageBar : UIView<UIGestureRecognizerDelegate>
 
-@property(nonatomic, retain) NSArray* items;
+@property(nonatomic, strong) NSArray* items;
 @property(nonatomic, assign) NSUInteger selectedIndex;
 @property(nonatomic, assign) CGFloat overlayPercentage;
-@property(nonatomic, readonly, retain) NSArray* buttons;
-@property(nonatomic, assign) id<NewTabPageBarDelegate> delegate;
+@property(nonatomic, readonly, strong) NSArray* buttons;
+@property(nonatomic, weak) id<NewTabPageBarDelegate> delegate;
 
 // Changes the colors of the buttons and overlay depending on the content offset
 // of the scroll view. Tablet Incognito only.
 - (void)updateColorsForScrollView:(UIScrollView*)scrollView;
 
 // Updates the alpha of the shadow image. When the alpha changes from 0 to 1 or
 // 1 to 0, the alpha change is animated.
 - (void)setShadowAlpha:(CGFloat)alpha;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_NTP_NEW_TAB_PAGE_BAR_H_